WO2018151129A1 - 吸音体、および、吸音構造 - Google Patents

吸音体、および、吸音構造 Download PDF

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Publication number
WO2018151129A1
WO2018151129A1 PCT/JP2018/005009 JP2018005009W WO2018151129A1 WO 2018151129 A1 WO2018151129 A1 WO 2018151129A1 JP 2018005009 W JP2018005009 W JP 2018005009W WO 2018151129 A1 WO2018151129 A1 WO 2018151129A1
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WO
WIPO (PCT)
Prior art keywords
main body
sound
opening
hole
porous sheet
Prior art date
Application number
PCT/JP2018/005009
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
妙子 上野
Original Assignee
株式会社 ニフコ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 ニフコ filed Critical 株式会社 ニフコ
Priority to DE112018000866.5T priority Critical patent/DE112018000866B4/de
Priority to US16/485,295 priority patent/US11420410B2/en
Priority to CN201880011679.0A priority patent/CN110431618B/zh
Publication of WO2018151129A1 publication Critical patent/WO2018151129A1/ja

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating

Definitions

  • the present disclosure relates to a sound absorber having a structure for absorbing sound, and a sound absorbing structure.
  • This type of sound absorber includes, for example, a sound absorbing material including a non-woven fabric and a plurality of bottomed cylindrical cells arranged two-dimensionally on a thin plate-like reflecting material. One opening surface of each bottomed cylindrical cell is joined to one surface of the sound absorbing material, and the other opening surface of each bottomed tubular cell is joined to one surface of the plate material.
  • the sound absorbing material is arranged so as to face the sound source, and the sound absorbing body absorbs the noise generated by the sound source by the cooperation of the sound absorbing material and the bottomed cylindrical cell.
  • the frequency band in which the above-described sound absorber can absorb sound is determined as either the high frequency band or the low frequency band depending on the basis weight and thickness of the sound absorbing material, and the height and opening size of the bottomed cylindrical cell. It is done.
  • the frequency band required for absorption of the sound absorber may extend to both the high frequency band and the low frequency band, the above-described sound absorber expands the frequency band of the sound that can be absorbed by the sound absorber. It is hoped that.
  • An object of the present disclosure is to provide a sound absorbing body and a sound absorbing structure capable of expanding a frequency band of sound that can be absorbed by the sound absorbing body.
  • a sound absorber in one aspect of the present disclosure, includes a main body having a bottomed cylindrical shape having an opening and a bottom, and a porous sheet covering the opening.
  • the main body includes at least one hole that is larger than the hole provided in the porous sheet and penetrates the main body between the opening and the bottom.
  • a sound absorbing structure in another aspect, includes a plurality of main bodies having a bottomed cylindrical shape having an opening and a bottom, a porous sheet covering each of the openings, and facing each of the bottoms, and common to each of the bottoms.
  • Each of the main bodies is at least one hole larger than the hole provided in the porous sheet and penetrating the main body between the opening and the bottom in the main body. Is provided.
  • FIG. 4 is a sectional view taken along line 4-4 of FIG.
  • FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;
  • action of the sound-absorbing body of FIG. The graph which shows the sound absorption characteristic in each test example.
  • the configuration of the sound absorber will be described, then the operation of the sound absorber will be described, and the measurement results of the sound absorption rate in each test example showing the effects of the configuration of the sound absorber will be described.
  • the sound absorber includes a laminate of a first sheet processed body 10S and a second sheet processed body 20S.
  • the first sheet processed body 10S is, for example, a resin sheet processed body
  • the second sheet processed body 20S is, for example, a sheet processed from any one of nonwoven fabric, woven fabric, Japanese paper, and foam. Is the body.
  • the first sheet processed body 10 ⁇ / b> S includes a plurality of main bodies 10.
  • the second sheet processed body 20 ⁇ / b> S includes one porous sheet 20 for each main body 10.
  • One main body 10 and one porous sheet 20 corresponding to the main body 10 constitute one sound absorber element.
  • Each sound absorber element is arranged two-dimensionally along a first direction D1 and a second direction D2 that are orthogonal to each other.
  • the sound absorber elements adjacent to each other in the first direction D1 and the sound absorber elements adjacent to each other in the second direction D2 are connected by a hinge 30.
  • each main body 10 is a membrane structure having a two-stage inverted frustum cylinder shape, and includes a large cylinder part 11, a small cylinder part 12, and a flange 13.
  • the large cylinder part 11 has a square cylinder shape having an opening part 11H (see FIG. 2) which is an opening part of the main body 10.
  • the small tube portion 12 has a square tube shape including the bottom portion 14 of the main body 10.
  • the flange 13 extends from each side of the opening of the small tube portion 12 toward the radially outer side of the small tube portion 12 and is connected to the small tube portion 12 and the large tube portion 11.
  • the flange 13 includes a hole 13 ⁇ / b> H that penetrates the flange 13 when viewed from the direction facing the bottom portion 14.
  • the size of each hole 13 ⁇ / b> H is sufficiently larger than the pores provided in the porous sheet 20.
  • the peripheral wall 11W of the large cylinder part 11, the peripheral wall 12W of the small cylinder part 12, and the flange 13 constitute one cylinder part 10W included in the main body 10.
  • the cylinder part 10W has a two-stage square cylinder shape, and connects the opening part 11H provided in the large cylinder part 11 and the bottom part 14 provided in the small cylinder part 12.
  • the cylinder portion 10 ⁇ / b> W includes ribs 11 ⁇ / b> R that extend from each corner portion of the bottom portion 14 toward the opening portion of the main body 10.
  • the ribs 11 ⁇ / b> R are concave ribs that are recessed toward the inside of the main body 10, and one rib 11 ⁇ / b> R is located on each of the four surfaces provided in the cylindrical portion 10 ⁇ / b> W of the large cylindrical portion 11.
  • each opening 11 ⁇ / b> H included in each large cylinder portion 11 is covered with a separate porous sheet 20.
  • the porous sheet 20 is made of, for example, any one of a nonwoven fabric, a woven fabric, Japanese paper, and a foam, and the size of the pores of the porous sheet 20 is sufficiently larger than that of the holes 13H. Small size.
  • each opening 11H has a square frame shape
  • each porous sheet 20 has a square sheet shape.
  • Each hinge 30 is configured as a welded portion between a part of the first sheet processed body 10S and a part of the second sheet processed body 20S.
  • Each hinge 30 has a rectangular frame shape that borders each opening 11H.
  • Each hinge 30 has flexibility to be bent at a bending axis along the hinge 30, and allows the two main bodies 10 coupled by the hinge 30 to be displaced by bending at the hinge 30.
  • Each hinge 30 is formed, for example, by thermally welding a portion bordering the opening 11H of the main body 10 to the second sheet processed body 20S.
  • Each main body 10 described above is formed by, for example, so-called vacuum forming in which a part of a resin sheet for forming the first sheet processed body 10S is sucked into a mold for forming the main body 10. .
  • the thermal welding for forming each hinge 30 and the vacuum forming for forming each main body 10 can be performed simultaneously.
  • Each main body 10 described above is formed by, for example, so-called press molding in which a part of a resin sheet for forming the first sheet processed body 10S is pressed by a mold for forming the main body 10. Is also possible. At this time, after the press molding for forming each main body 10 is performed, thermal welding for forming each hinge 30 is performed.
  • the large tube portion 11 and the small tube portion 12 are located on the same central axis when viewed from the direction facing the bottom portion 14.
  • the large cylinder portion 11 includes four corner portions
  • the small cylinder portion 12 also includes four corner portions.
  • the positions of the corners provided in the large cylinder part 11 and the positions of the corners provided in the small cylinder part 12 are different from each other around the central axis.
  • the shape of the small tube portion 12 is similar to, for example, a shape obtained by rotating the shape of the large tube portion 11 by 45 ° around the central axis.
  • the above-described sound absorber is disposed, for example, between a wall portion such as a lining of a passenger compartment and a sound source.
  • the sound absorber is arranged so that the bottom portion 14 and the wall portion of the main body 10 face each other, and the pressing force received from the wall portion or the pressing force received from the sound source side acts to crush the main body 10.
  • each corner provided in the large tube portion 11 and each corner provided in the small tube portion 12 are in mutually different positions in the circumferential direction of the central axis.
  • the portions having mechanically high strength against pressure are dispersed in the circumferential direction in the main body 10. Therefore, the shape of the main body 10 can be maintained against the pressing force in the direction in which the main body 10 is crushed.
  • Each flange 13 has a triangular plate shape when viewed from the direction facing the bottom portion 14.
  • the triangular plate shape of each flange 13 has each side of the opening provided in the small tube portion 12 as a base and the corner of the large tube portion 11 as a vertex.
  • the main body 10 includes four flanges 13, and of the four flanges 13, two flanges 13 positioned on a diagonal line each include a hole 13 ⁇ / b> H.
  • Each rib 11R extends from each corner portion of the bottom portion 14 to the hinge 30 facing the corner portion, and extends in a direction perpendicular to the extending direction of the hinge 30.
  • the main body 10 that is integral with the hinge 30 is likely to be bent or stretched along with the deformation of the hinge 30.
  • the rib 11R connected to the hinge 30 extends in a direction orthogonal to the extending direction of the hinge 30, so that bending and elongation accompanying deformation of the hinge 30 are suppressed in the main body 10, and the main body 10 shapes can be maintained.
  • the large cylinder portion 11 has a height H1
  • the small cylinder portion 12 has a height H2 larger than the height H1.
  • the height H1 which the large cylinder part 11 has may be the same as the height H2 which the small cylinder part 12 has, and may be larger than the height H2 which the small cylinder part 12 has.
  • the height H1 of the large cylinder portion 11 and the height H2 of the small cylinder portion 12 can be changed as appropriate by changing the mold for forming the main body 10.
  • the thickness T1 of the bottom portion 14 may be the same as the thickness of the cylindrical portion 10W of the main body 10, or may be different from the thickness T2 of the cylindrical portion 10W of the main body 10. Further, the thickness T1 of the bottom portion 14 may be the same as the thickness T3 of the hinge 30 or may be different from the thickness of the hinge 30.
  • the height H1 of the large cylindrical portion 11, the height H2 of the small cylindrical portion 12, the thickness T1 of the bottom portion 14, and the thickness T2 of the cylindrical portion 10 ⁇ / b> W are the frequency band in sound absorption required for the main body 10, and the main body 10 is set as appropriate according to the mechanical strength required for 10.
  • each flange 13 spreads is substantially parallel to the direction in which the bottom portion 14 spreads.
  • the area S3 that each flange 13 has is smaller than the area S4 that the bottom portion 14 has.
  • the area S3 which the flange 13 has may be the same as the area S4 which the bottom part 14 has, and may be larger than the area S4 which the bottom part 14 has.
  • the area S3 of each flange 13 and the area S4 of the bottom 14 can be changed as appropriate by changing the mold for forming the main body 10.
  • the hole 13H is formed in the resin sheet for forming the first sheet processed body 10S, and then the shape of the main body 10 is formed from the resin sheet in which the hole 13H is formed.
  • the method of obtaining can also be adopted.
  • the shape of the main body 10 is obtained by using vacuum molding, press molding, or the like, the shape and size of the already processed hole 13H may vary from its design dimensions.
  • the size of the flange 13, the size of the bottom 14, the shape of the hole 13 ⁇ / b> H, and the size of the hole 13 ⁇ / b> H are determined by the frequency band of sound absorption required for the main body 10 and the sound absorption required for the hole 13 ⁇ / b> H. It is set as appropriate according to the frequency band.
  • the operation of the above-described sound absorber will be described.
  • the sound propagated from the outside of the sound absorber to the porous sheet 20 propagates to the air in the pores of the porous sheet 20, and vibrations of fibers constituting the porous sheet 20, It is consumed by friction with it.
  • a part of the sound propagated to the porous sheet 20 is absorbed by the porous sheet 20.
  • Such porous sound absorption absorbs sound in a high frequency band, for example.
  • the sound propagated through the porous sheet 20 to the inside of the main body 10 propagates to the air in the main body 10 and is consumed by the vibration in the membrane structure of the cylindrical portion 10W constituting the main body 10.
  • a part of the sound propagated in the main body 10 without being absorbed by the porous sheet 20 is absorbed by the film structure constituting the main body 10.
  • the structure related to the sound absorption performed by the porous sheet 20 and the type of the porous type are different from the structure related to the sound absorption performed by the main body and the type of the membrane vibration type. Therefore, the frequency bands absorbed by these are also different from each other.
  • Such membrane vibration type sound absorption absorbs sound in a lower frequency band than porous type sound absorption.
  • the sound propagating from the inside of the main body 10 to the outside of the main body 10 propagates to the air through the holes 13H constituting the main body 10 and is consumed in the system constituted by the space around the small tube portion 12 and the holes 13H. Is done. That is, the periphery of the main body 10 including the flange 13 having the hole 13H and the space sandwiched between the flange 13 and the wall W functions as the Helmholtz resonator K. As a result, a part of the sound propagating from the inside of the main body 10 to the outside of the main body 10 is absorbed by the system composed of the cavity around the small tube portion 12 and the hole 13H.
  • the structure of the hole 13H related to sound absorption and the resonance structure type which is the type thereof are different from the structure related to sound absorption performed by the main body 10 and the porous sheet 20 and the type thereof. Therefore, the frequency bands absorbed by these are also different from each other.
  • Such resonance structure type sound absorption absorbs sound in a lower frequency band than membrane vibration type sound absorption.
  • the sum total of the height H1 of the large cylinder part 11 and the height H2 of the small cylinder part 12 described above is the height of the air layer in the main body 10, and in particular, the height of the air layer is sufficiently secured. If this is not possible, it is difficult to absorb sound in the low frequency band with the above-described porous sound absorption and membrane vibration absorption.
  • the sound absorber includes the hole 13H, the sound in the low frequency band is absorbed by the above-described resonance structure type sound absorption even when the height of the air layer is not sufficiently secured.
  • Test Example 1 A polypropylene sheet was used as the resin sheet, and a first processed sheet 10S having no holes 13H was obtained.
  • Test Example 1 was obtained as a sound absorber without the holes 13H and the second sheet processed body 20S.
  • the hole 13H was processed into the 1st sheet
  • the nonwoven fabric was heat-welded to the 1st sheet
  • the reverberation chamber method sound absorption rate based on ISO345 was measured.
  • the measurement result of the reverberation chamber method sound absorption coefficient using each test example is shown in FIG.
  • measurement was performed centering on 800 Hz to 5000 Hz which is particularly easy to hear in a human audible range.
  • the reverberation chamber method sound absorption rate of Test Example 2 is higher than the reverberation chamber method sound absorption rate of Test Example 1 in the range from 800 Hz to 5000 Hz, and particularly in the low frequency band side, 800 Hz. From 1 to 2000 Hz, a significant improvement was observed.
  • the reverberation chamber method sound absorption coefficient of Test Example 3 was higher than the reverberation room method sound absorption coefficient of Test Example 2 in the range from 1000 Hz to 5000 Hz, and was significantly improved particularly in the range from 1000 Hz to 4000 Hz. .
  • the sound absorption performance on the high frequency band side is enhanced by the configuration including the porous sheet 20
  • the sound absorption performance on the low frequency band side is enhanced by the configuration including the holes 13H.
  • each main body 10 adjacent to each other are bent by the hinge 30, the position of each main body 10 can be made to follow the shape of the surface on which the sound absorber is arranged. As a result, it is possible to expand the range of the structure such as the wall portion to which the sound absorber is applied, and to effectively absorb the sound toward the wall portion on which the sound absorber is disposed.
  • Such a space is a space facing the hole 13H, and suitably expresses the above-described resonance structure type sound absorption.
  • the flange 13 is irradiated with a laser or the like traveling from the bottom portion 14 toward the opening portion 11H, whereby the hole 13H can be formed. Therefore, the holes 13H can be formed in the main body 10 even after the main body 10 is formed or after the opening 11H is covered with the porous sheet 20.
  • the above embodiment can be implemented with the following modifications.
  • the sound absorber can be composed of only one sound absorber element described above. That is, it is possible that the sound absorber has one main body 10 and the sound absorber has one porous sheet 20.
  • the number of sound absorbing elements provided in the sound absorbing body and the direction in which the sound absorbing elements are arranged in the sound absorbing body are appropriately changed based on the size and shape of the space to which the sound absorbing body is applied.
  • the sound absorber can include a plurality of sound absorber elements having different sizes from each other, and can also include a plurality of sound absorber elements having different shapes from each other.
  • the main body 10 having different sizes can be included, and the porous sheet 20 made of different materials can also be included. It is.
  • the cylinder part 10W with which the main body 10 is provided can be embodied in a shape in which the above-described flange 13 is omitted and does not have a step.
  • the hole 13H provided in the main body 10 has a shape that penetrates the cylindrical portion 10W along the radial direction of the cylindrical portion 10W.
  • the shape of the cylindrical portion 10W included in the main body 10 can be embodied in a multistage cylindrical shape having three or more stages. At this time, the hole 13H provided in the main body 10 can also be positioned at the flange of each step provided in the cylindrical portion 10W.
  • the shape of the large cylinder portion 11 can be embodied in any one of an inverted truncated cone cylinder, an inverted polygonal truncated cone, a cylinder, and a polygonal cylinder.
  • the shape with which the small cylinder part 12 is provided can be embodied in any of an inverted truncated cone shape, an inverted polygonal truncated cone shape, a cylindrical shape, a polygonal cylindrical shape, an inverted conical shape, and an inverted pyramid shape.
  • the shape with which the small cylinder part 12 is provided is a reverse cone shape
  • the bottom part with which the main body 10 is provided is a bottom end part with which the small cylinder part 12 is provided.
  • the number of the ribs 11R included in the main body 10 can be two or more on each side surface of the large cylinder portion 11, and the large cylinder portion 11 can include a side surface from which the ribs 11R are omitted.
  • the shape of the rib 11R included in the main body 10 can be embodied as a ridge protruding toward the outside of the main body 10. Further, one main body 10 can include a combination of a convex rib and a concave rib as the rib 11R.
  • the rib 11R can be omitted from the small tube portion 12 and can be located only in the large tube portion 11. Conversely, the rib 11R can be omitted from the large tube portion 11 and located only in the small tube portion 12.
  • [Hole 13H] The hole 13H with which the main body 10 is provided can also be provided with the shape which penetrates the cylinder part 10W along the radial direction of the cylinder part 10W, for example.
  • the number of holes 13H provided in the main body 10 can be one, or can be three or more.
  • One main body 10 can also be provided with the hole 13H which has a mutually different shape, and can also be provided with the hole 13H which has a mutually different magnitude
  • the sound absorber can also include a plurality of main bodies 10 separately provided with holes 13H having different shapes, and a plurality of main bodies 10 provided with holes 13H having different sizes can be provided. It is also possible to provide.
  • the sound absorber may include a plurality of main bodies 10 and one wall portion that faces each bottom portion 14 and is common to each bottom portion 14.
  • the wall functions as, for example, a lining of a passenger compartment.
  • the sound absorbing body since the sound absorbing body includes one wall portion common to the bottom portions 14, the sound absorbing body including the plurality of main bodies 10 can be easily transported and attached. It is also possible to.
  • the sound absorbing structure includes a plurality of the main bodies, the porous sheet, and one wall portion that is opposed to the bottom portion included in each main body and is common to each bottom portion.
  • each main body has a bottomed cylindrical shape having an opening and a bottom, and the porous sheet covers each opening.
  • each main body is provided with at least 1 hole which is larger than the hole with which a porous sheet is provided, and penetrates a main body between an opening part and a bottom part. Even in such a sound absorbing structure, the effects according to the above (1) to (6) can be obtained, and the sound absorbing structure can be easily transported and attached.
  • this sound absorbing structure when installed in the interior of an automobile or the like, it is possible to perform resonance structure type sound absorption between the main body and the interior trim board by attaching the body to the interior trim board.
  • the wall portion can be embodied not only in the interior trim board but also in the body panel.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
PCT/JP2018/005009 2017-02-16 2018-02-14 吸音体、および、吸音構造 WO2018151129A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112018000866.5T DE112018000866B4 (de) 2017-02-16 2018-02-14 Schallabsorbierender Körper und schallabsorbierende Struktur
US16/485,295 US11420410B2 (en) 2017-02-16 2018-02-14 Sound absorbing body and sound absorbing structure
CN201880011679.0A CN110431618B (zh) 2017-02-16 2018-02-14 吸声体和吸声构造

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-026636 2017-02-16
JP2017026636A JP6636471B2 (ja) 2017-02-16 2017-02-16 吸音体、および、吸音構造

Publications (1)

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WO2018151129A1 true WO2018151129A1 (ja) 2018-08-23

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US (1) US11420410B2 (de)
JP (1) JP6636471B2 (de)
CN (1) CN110431618B (de)
DE (1) DE112018000866B4 (de)
WO (1) WO2018151129A1 (de)

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CN113345398A (zh) * 2021-06-02 2021-09-03 湘潭大学 一种基于微孔薄膜和微型声学黑洞结构的全频带吸声结构
US11420410B2 (en) 2017-02-16 2022-08-23 Nifco Inc. Sound absorbing body and sound absorbing structure

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JP7028125B2 (ja) 2018-09-25 2022-03-02 トヨタ車体株式会社 吸遮音構造
WO2020065705A1 (ja) * 2018-09-25 2020-04-02 河西工業株式会社 自動車用遮音パネル
WO2020095344A1 (ja) * 2018-11-05 2020-05-14 ヤマハ株式会社 吸音用部材、吸音用ユニットおよび吸音構造体
CN113903321B (zh) * 2021-12-09 2022-03-08 北京市科学技术研究院城市安全与环境科学研究所 一种低压背腔吸声单元及建筑壁面

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